US4881429A - Shift control arrangement for automatic transmission - Google Patents
Shift control arrangement for automatic transmission Download PDFInfo
- Publication number
- US4881429A US4881429A US07/188,509 US18850988A US4881429A US 4881429 A US4881429 A US 4881429A US 18850988 A US18850988 A US 18850988A US 4881429 A US4881429 A US 4881429A
- Authority
- US
- United States
- Prior art keywords
- clutch
- transmission
- valve
- carrier
- solenoid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
- F16H61/0437—Smoothing ratio shift by using electrical signals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
- F16H2061/044—Smoothing ratio shift when a freewheel device is disengaged or bridged
Definitions
- the present invention relates generally to an automatic transmission and more specifically to a control system for such a device.
- a one-way clutch and a forward clutch are directly aligned and an overrunning clutch is arranged in parallel with the one way clutch and the forward clutch.
- the forward clutch is engaged in all forward gears (viz., engaged in first, second, third and fourth gears).
- the one-way clutch is engaged during first, second and third forward speeds and un-engaged during fourth speed.
- the overrunning clutch When the transmission is conditioned for D range the overrunning clutch is not engaged however it is engaged when engine braking is required and the transmission is selectively conditioned to produce one of first, second and third gears. Accordingly, when the transmission is set in D range rotational energy is transmitted via the forward and one-way clutches. With this arrangement the shift timing between third and fourth gears is easily adjusted.
- the sudden re-application of torque to the device causes a sudden amount of movement, such as shown at K in FIG. 5C, and the knocking produced when the two elements engage at the end of the movement.
- the invention provides an arrangement wherein, during upshifting under low engine load, a hydraulically controlled clutch, which is arranged in parallel with the one-way unit in which the noise is generated, is momentary supplied with line pressure.
- the present invention is deemed to take the form of a transmission which features: a one-way clutch; a first clutch, the first clutch being directly connected with the one way clutch; a second clutch, the second clutch being connected in parallel with the first clutch and the one-way clutch; a solenoid valve, the solenoid valve having first and second operative states, the solenoid valve being arranged to induce the second clutch to engage when in the first operative state; means for discerning a transmission upshift operation; means for detecting the engine throttle valve assuming a closed position; and solenoid energization means responsive to the upshift discerning means and the closed throttle valve detection means, for conditioning the solenoid to assume the first stage for a predetermined time.
- FIG. 1 shows in schematic form a gear train of a transmission to which the present invention is applied
- FIG. 2 is a sectional view showing a valve and control arrangement which forms a vital part of the invention
- FIG. 3 is a flow chart showing the characterizing steps which are executed in connection with the control of the present invention.
- FIG. 4 is a timing chart showing the control provided by the instant embodiment.
- FIG. 5 is a timing chart similar to that shown in FIG. 4 but which demonstrates the problem which occurs in the prior art disclosed hereinbefore.
- FIG. 1 shows a gear train of a transmission to which the present invention is applied.
- a torque converter 10 and lock-up clutch 11 are arranged to receive engine torque through an engine output shaft 12 and to transmit this rotational energy to a transmission input shaft 13.
- a description of the same will be omitted for brevity.
- a final drive unit (not shown) is operatively connected to the transmission output shaft 14.
- a first planetary gear unit 15 Operatively disposed between the input and output shafts 13 and 14 are a first planetary gear unit 15, a second planetary gear unit 16, a reverse clutch 18, a high clutch 20, a forward clutch 22, an overrunning clutch 24, a low and reverse brake 26, a band brake 28, a low one-way clutch 29 and a forward one-way cluch 30.
- the first planetary gear unit 15 includes a sun gear S1, an internally toothed ring gear R1, a pinion carrier PC1 and pinion gears P1 operatively mounted on the carrier in a manner to establish a connection between the ring and sun gears R1, S1.
- the second planetary gear unit similarly includes a sun gear S2, an internally toothed ring gear R2, a pinion carrier PC2 and pinion gears P2.
- the carrier PC1 of the first unit is connected to the input shaft 13 by way of high clutch 20.
- Sun gear S1 is connected with the input shaft 13 by way of the reverse clutch 18, and the carrier PC1 is connected with the forward clutch 22 and the forward one-way clutch 30 which is directly connected thereto.
- Ring gear R2 of the second planetary gear unit is connected with the forward clutch 22 by way of the forward one-way clutch 30 and with the overrunning clutch 24 which is arranged in parallel with elements 22 and 30.
- the sun gear S2 of the second gear unit 16 is directly and continuously connected with the input shaft 13 while the ring gear R1 and the carrier PC2 are in constant direct connection with the output shaft 14.
- the low and reverse brake 26 is arranged to render the carrier PC1 of the first planetary gear set 15 stationary when engaged, while the band brake 28 is arranged to prevent rotation of sun gear S1 of the first planetary gear set 15 when applied.
- the low one-way clutch 29 is arranged to permit the carrier PC1 to rotate in the same direction as the input shaft 12 and prevent rotation in the reverse direction.
- FIG. 2 shows in detail the arrangement of the overrunning clutch 24 and an engagement control arrangement which is associated therewith in accordance with the present invention.
- the control arrangement includes a solenoid 60 which is arranged with a shuttle valve 56 and an overrunning clutch control valve 58.
- conduits 112 are connected with a source of line pressure while conduit 79 is supplied a pilot pressure.
- the solenoid 60 is arranged to be energized and de-energized in a manner which modifies the supply of pilot pressure to the shuttle valve 56.
- the supply of pilot pressure to the overrunning clutch control valve 58 is controlled. This control in turn controls the supply of line pressure to the overrunning clutch 24 via conduit 138.
- Solenoid 60 is operatively connected with a control unit 38 which in this instance includes a microprocessor. Although not specifically illustrated, this processor includes at least one RAM, ROM, CPU and I/O interface.
- the control unit is arranged to receive data inputs from a vehicle speed sensor 40, a throttle opening sensor 42 and a fully closed throttle position sensing switch 44.
- the ROM of the microprocessor contains a control program the nature of which is illustrated in the flow chart shown in FIG. 3. As will be readily appreciated, the first two steps of this routine are such as to sample the output of the throttle position sensor and the vehicle speed sensor and to set these values in RAM ready for further processing.
- step 104 the instant vehicle speed and throttle setting are used to determine the instant shift position from a predetermined prememorized shift pattern.
- This decision can be made by determining the position defined by the instant engine load and vehicle speed values and determining which shift zone the position falls in and the time for which the point has resided in the same.
- a predetermined time for example 500 ms to one second
- step 106 In the event that the outcome of step 106 is such as to indicate that no shift command need be issued the program flows to step 108 wherein a command which maintains the current shift status is issued.
- step 110 the appropriate shift is determined in step 110 and in step 111 appropriate commands which induce the shift indicated by the outcome of step 110 are issued.
- step 113 the commands issued in the previous step are screened in a manner to determine if any one of a 1-2, 1-3 or a 2-3 shift has been issued. If the outcome is negative the program returns. However, in the instance that the shift ordered in step 111 is one of the three listed hereinbefore, the program proceeds to step 114 wherein the instant status of the throttle closure detection switch 44 is sampled.
- switch 44 is not closed, indicating that the throttle valve is opened beyond a predetermined angle, the program returns. On the other hand, in the event the switch is closed indicating that the throttle is closed and/or close to closed, the program flows to step 116.
- step 116 a command to energize solenoid 60 for a predetermined time t is issued.
- t The effect of this energization will be discussed hereinafter.
- overrunning clutch 24 When solenoid 60 is energized overrunning clutch 24 is supplied with hydraulic pressure (line pressure) and thus is engaged in manner wherein it is capable of transmitting rotational energy. Under these conditions the one-way clutch 30 is changed from an un-engaged or free condition to a connected or engaged one and the undesirable knocking noise is prevented.
- FIG. 4 is a timing chart showing the ON/OFF timing of the solenoid 60; the hydraulic pressure prevailing in the overrunning clutch 24; engine rotational speed; torque fluctuation; and the relatively rotation between the inner and outer races of the one-way clutch 30, as provided by the present invention.
- the engine speed, torque and relative rotation characteristics should be compared with those shown in FIG. 5.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
Abstract
Description
TABLE 1 __________________________________________________________________________ OWC OWC α.sub.1 = 0.440 C18 C20 C22C24 B28 B26 30 29 GEAR RATIO α.sub.2 __________________________________________________________________________ = 0.493 D RANGE 1st o o o ##STR1## 3.027 2nd o o o ##STR2## 1.6193rd o o o 1 1.000 4th o (o) o ##STR3## 0.694 ENGINE BRAKING 1st (o) o o (o) (o) 2nd (o) o o (o) 3rd o (o) o (o) 4th o (o) o REVERSE o o ##STR4## -2.272 __________________________________________________________________________ (Bracketed elements unrelated to power transmission path)
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/188,509 US4881429A (en) | 1988-04-29 | 1988-04-29 | Shift control arrangement for automatic transmission |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/188,509 US4881429A (en) | 1988-04-29 | 1988-04-29 | Shift control arrangement for automatic transmission |
Publications (1)
Publication Number | Publication Date |
---|---|
US4881429A true US4881429A (en) | 1989-11-21 |
Family
ID=22693455
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/188,509 Expired - Lifetime US4881429A (en) | 1988-04-29 | 1988-04-29 | Shift control arrangement for automatic transmission |
Country Status (1)
Country | Link |
---|---|
US (1) | US4881429A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5133231A (en) * | 1990-04-11 | 1992-07-28 | Aisin Seiki Kabushiki Kaisha | Hydraulic control system for automatic transmission |
US5154100A (en) * | 1988-02-01 | 1992-10-13 | Japan Automatic Transmission Co., Ltd. | System for controlling automatic power transmission |
US5168777A (en) * | 1990-04-10 | 1992-12-08 | Aisin Seiki Kabushiki Kaisha | Hydraulic control system for automatic transmission |
US5182970A (en) * | 1990-04-04 | 1993-02-02 | Aisin Seiki Kabushiki Kaisha | Hydraulic control system for automatic transmission |
EP0849504A2 (en) * | 1996-12-17 | 1998-06-24 | Hyundai Motor Company | Shift control method for automatic transmissions |
US5902213A (en) * | 1997-01-30 | 1999-05-11 | Aisin Aw Co., Ltd. | Shift control device for automatic transmission |
Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3684066A (en) * | 1969-10-08 | 1972-08-15 | Toyota Motor Co Ltd | Automatic shift control system for automatic transmission |
JPS5533911A (en) * | 1978-08-28 | 1980-03-10 | Aisin Warner Ltd | Shock preventive device at speed change in automatic transmission |
GB2031533A (en) * | 1978-08-07 | 1980-04-23 | Nissan Motor | Shift shock reducing device |
JPS59151652A (en) * | 1983-02-15 | 1984-08-30 | Nissan Motor Co Ltd | Hydraulic control device in automatic transmission |
US4502354A (en) * | 1980-09-04 | 1985-03-05 | Nissan Motor Company, Limited | Hydraulic pressure control system for automatic transmission |
US4667540A (en) * | 1984-02-24 | 1987-05-26 | Nissan Motor Co., Ltd. | Shift shock alleviating apparatus and method for automatic transmission |
JPS62124343A (en) * | 1985-11-22 | 1987-06-05 | Toyota Motor Corp | Hydraulic control device of automatic speed change gear |
US4680992A (en) * | 1985-08-05 | 1987-07-21 | Nissan Motor Co., Ltd. | Downshift timing and engine brake control for automatic transmission |
US4715145A (en) * | 1984-06-01 | 1987-12-29 | Nissan Motor Co., Ltd. | Lock-up control for shockless gear shifting |
US4722247A (en) * | 1984-10-19 | 1988-02-02 | Toyota Jidosha Kabushiki Kaisha | Shift control system of automatic transmission |
US4730521A (en) * | 1985-09-11 | 1988-03-15 | Nissan Motor Co., Ltd. | Control system for alleviating shock in automatic transmission |
US4744031A (en) * | 1984-02-23 | 1988-05-10 | Nissan Motor Co., Ltd. | Method of and apparatus for alleviating shift shocks of automatic transmission |
US4791568A (en) * | 1984-09-29 | 1988-12-13 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Method of controlling hydraulic pressure for an automatic transmission gear system |
US4807132A (en) * | 1985-07-15 | 1989-02-21 | Diesel Kiki Co., Ltd. | Apparatus for controlling an internal combustion engine for vehicles |
US4819163A (en) * | 1985-12-21 | 1989-04-04 | Toyota Jidosha Kabushiki Kaisha | Driving power control system |
-
1988
- 1988-04-29 US US07/188,509 patent/US4881429A/en not_active Expired - Lifetime
Patent Citations (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3684066A (en) * | 1969-10-08 | 1972-08-15 | Toyota Motor Co Ltd | Automatic shift control system for automatic transmission |
GB2031533A (en) * | 1978-08-07 | 1980-04-23 | Nissan Motor | Shift shock reducing device |
JPS5533911A (en) * | 1978-08-28 | 1980-03-10 | Aisin Warner Ltd | Shock preventive device at speed change in automatic transmission |
US4502354A (en) * | 1980-09-04 | 1985-03-05 | Nissan Motor Company, Limited | Hydraulic pressure control system for automatic transmission |
JPS59151652A (en) * | 1983-02-15 | 1984-08-30 | Nissan Motor Co Ltd | Hydraulic control device in automatic transmission |
US4744031A (en) * | 1984-02-23 | 1988-05-10 | Nissan Motor Co., Ltd. | Method of and apparatus for alleviating shift shocks of automatic transmission |
US4667540A (en) * | 1984-02-24 | 1987-05-26 | Nissan Motor Co., Ltd. | Shift shock alleviating apparatus and method for automatic transmission |
US4715145A (en) * | 1984-06-01 | 1987-12-29 | Nissan Motor Co., Ltd. | Lock-up control for shockless gear shifting |
US4791568A (en) * | 1984-09-29 | 1988-12-13 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Method of controlling hydraulic pressure for an automatic transmission gear system |
US4722247A (en) * | 1984-10-19 | 1988-02-02 | Toyota Jidosha Kabushiki Kaisha | Shift control system of automatic transmission |
US4807132A (en) * | 1985-07-15 | 1989-02-21 | Diesel Kiki Co., Ltd. | Apparatus for controlling an internal combustion engine for vehicles |
US4680992A (en) * | 1985-08-05 | 1987-07-21 | Nissan Motor Co., Ltd. | Downshift timing and engine brake control for automatic transmission |
US4730521A (en) * | 1985-09-11 | 1988-03-15 | Nissan Motor Co., Ltd. | Control system for alleviating shock in automatic transmission |
US4807496A (en) * | 1985-09-11 | 1989-02-28 | Nissan Motor Co., Ltd. | Control system for alleviating shock in automatic transmission |
JPS62124343A (en) * | 1985-11-22 | 1987-06-05 | Toyota Motor Corp | Hydraulic control device of automatic speed change gear |
US4819163A (en) * | 1985-12-21 | 1989-04-04 | Toyota Jidosha Kabushiki Kaisha | Driving power control system |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5154100A (en) * | 1988-02-01 | 1992-10-13 | Japan Automatic Transmission Co., Ltd. | System for controlling automatic power transmission |
US5182970A (en) * | 1990-04-04 | 1993-02-02 | Aisin Seiki Kabushiki Kaisha | Hydraulic control system for automatic transmission |
US5293789A (en) * | 1990-04-04 | 1994-03-15 | Aisin Seiki Kabushiki Kaisha | Hydraulic control system with condition responsive accumulator control for automatic transmission |
US5168777A (en) * | 1990-04-10 | 1992-12-08 | Aisin Seiki Kabushiki Kaisha | Hydraulic control system for automatic transmission |
US5133231A (en) * | 1990-04-11 | 1992-07-28 | Aisin Seiki Kabushiki Kaisha | Hydraulic control system for automatic transmission |
EP0849504A2 (en) * | 1996-12-17 | 1998-06-24 | Hyundai Motor Company | Shift control method for automatic transmissions |
EP0849504A3 (en) * | 1996-12-17 | 1999-06-16 | Hyundai Motor Company | Shift control method for automatic transmissions |
US6016456A (en) * | 1996-12-17 | 2000-01-18 | Hyundai Motor Company | Shift control method for automatic transmissions |
US5902213A (en) * | 1997-01-30 | 1999-05-11 | Aisin Aw Co., Ltd. | Shift control device for automatic transmission |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4970916A (en) | Shift control system for automatic transmission | |
US5203235A (en) | Control system for automotive automatic transmission | |
US4881429A (en) | Shift control arrangement for automatic transmission | |
US4694709A (en) | Control of a vehicle automatic transmission | |
JPS61256049A (en) | Control method of speed change in automatic transmission for vehicle | |
US5364317A (en) | Control system for automotive automatic transmission | |
US5233889A (en) | Control system for automotive automatic transmission | |
US5094130A (en) | Shift control system for automatic power transmission with feature of suppression of shift shock during 4-2 downshift | |
JPH0214933A (en) | Integrated controller for power train | |
EP1188965B1 (en) | Method and apparatus for controlling the shifting of an automatic transmission | |
US5319998A (en) | Method for downshifting of automatic transmission with discrimination of magnitude of need therefor | |
US5417627A (en) | Shift controller using shift timing or speed ratio dependent on the change of one way clutch for automotive automatic transmission | |
US5150634A (en) | Control arrangement for automatic automotive transmission | |
JPH0392666A (en) | Gear shift control device for automatic transmission | |
US5383820A (en) | Control system for automotive automatic transmission | |
US5010788A (en) | Automatic automotive transmission having 4-2 downshift sequence valve | |
US5303615A (en) | Line pressure control of automatic transmission | |
US4677879A (en) | Transmission for four-wheel drive vehicles | |
US5247857A (en) | Control arrangement for automatic automotive transmission | |
US6887183B2 (en) | System and method of controlling automatic transmission | |
US5095775A (en) | Hydraulic pressure control system for automatic transmission | |
US6106433A (en) | Control system of automotive automatic transmission | |
JP2926786B2 (en) | Transmission control device for automatic transmission | |
US5042329A (en) | Control system for automatic transmission featuring improved downshifting characteristics with overdrive inhibitor | |
JPH05126246A (en) | Speed change control device for automatic transmission |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: NISSAN MOTOR CO., LTD., NO. 2, TAKARA-CHO, KANAGAW Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:KOBAYASHI, MASAYUKI;TAKIGUCHI, MASAHIRO;REEL/FRAME:004903/0264 Effective date: 19880106 Owner name: JAPAN AUTOMATIC TRANSMISSION CO., LTD., NO. 700-1, Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:KOBAYASHI, MASAYUKI;TAKIGUCHI, MASAHIRO;REEL/FRAME:004903/0264 Effective date: 19880106 Owner name: NISSAN MOTOR CO., LTD.,JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KOBAYASHI, MASAYUKI;TAKIGUCHI, MASAHIRO;REEL/FRAME:004903/0264 Effective date: 19880106 Owner name: JAPAN AUTOMATIC TRANSMISSION CO., LTD.,JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KOBAYASHI, MASAYUKI;TAKIGUCHI, MASAHIRO;REEL/FRAME:004903/0264 Effective date: 19880106 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
FPAY | Fee payment |
Year of fee payment: 12 |
|
AS | Assignment |
Owner name: JATCO CORPORATION, JAPAN Free format text: CHANGE OF NAME;ASSIGNOR:JAPAN AUTOMATIC TRANSMISSION CO., LTD.;REEL/FRAME:013684/0536 Effective date: 19891001 Owner name: JATCO LTD, JAPAN Free format text: CHANGE OF NAME AND ADDRESS;ASSIGNOR:JATCO TRANSTECHNOLOGY LTD.;REEL/FRAME:013669/0138 Effective date: 20020404 Owner name: JATCO TRANSTECHNOLOGY LTD., JAPAN Free format text: MERGER;ASSIGNOR:JATCO CORPORATION;REEL/FRAME:013669/0264 Effective date: 19991001 |